[Mac] Remove a panel from stack window bounds update list when it is being removed

chrome/browser/ui/cocoa/panels/panel_stack_window_cocoa.mm

Index: chrome/browser/ui/cocoa/panels/panel_stack_window_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/panels/panel_stack_window_cocoa.mm b/chrome/browser/ui/cocoa/panels/panel_stack_window_cocoa.mm
index 8c03cb6f7f2d5403349578a0ee2e1b438e711564..e2a75fa1a8204274962ab0e1a6d5dee172f381e7 100644
--- a/chrome/browser/ui/cocoa/panels/panel_stack_window_cocoa.mm
+++ b/chrome/browser/ui/cocoa/panels/panel_stack_window_cocoa.mm
@@ -82,6 +82,11 @@ void PanelStackWindowCocoa::AddPanel(Panel* panel) {
 }
 
 void PanelStackWindowCocoa::RemovePanel(Panel* panel) {
+  if (IsAnimatingPanelBounds()) {
+    // This panel is gone. We should not perform any update to it.
+    bounds_updates_.erase(panel);
+  }
+
   panels_.remove(panel);
 
   // If the native panel is closed, the native window should already be gone.